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Top Forums UNIX for Advanced & Expert Users What my puzzle file!, How to remove special characters ?? Post 302790239 by Don Cragun on Friday 5th of April 2013 03:38:46 AM
Old 04-05-2013
Quote:
Originally Posted by bakunin
The short answer is: you can't The single char "ls" shows is the End-of-File-character (literally a "^D") and it isn't possible with "vi" to delete it. In fact "vi" will even append such a EOF char to a file if it was missing.

Generate a file with "touch", it will have 0 characters. Now open this in "vi", write some text, delete it completely (this way "vi" thinks you have changed the file, do NOT use the undo-function) and save the file. You will notice that it has also 1 character in it - the EOF char.

I hope this helps.

bakunin
Sorry, but no. UNIX text files do not have an End-of-File character. Each line in a text file is terminated by a <newline> character. If you have a file open in vi and issue the commands:
Code:
:1,$d
:w file

(which deletes all lines in the file), the size of file will be 0 bytes.

If you have exactly one line in a file and you edit it with vi and delete all of the characters on the line by repeatedly executing the x command until the line is empty and then issue the command:
:w file
then the size of file will be 1 byte because you didn't delete the line, you just deleted the characters on the line preceding the terminating <newline> character.

The current line (including the terminating <newline> character can also be deleted in vi with the dd command.
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uuencode(4)						     Kernel Interfaces Manual						       uuencode(4)

NAME
uuencode - format of an encoded uuencode file DESCRIPTION
Files output by consist of a header line followed by a number of body lines, and a trailer line. The command ignores any lines preceding the header or following the trailer (see uuencode(1)). Lines preceding a header must not look like a header. The header line consists of the word followed by a space, a mode (in octal), another space, and a string which specifies the name of the remote file. The body consists of a number of lines, each containing 62 or fewer characters (including trailing new-line). These lines consist of a character count, followed by encoded characters, followed by a newline. The character count is a single printing character, which represents an integer. This integer is the number of bytes in the rest of the line, and always ranges from 0 to 63. The byte count can be determined by subtracting the equivalent octal value of an ASCII space charac- ter (octal 40) from the character. Groups of 3 bytes are stored in 4 characters, 6 bits per character. All are offset by a space to make the characters printable. The last line may be shorter than the normal 45 bytes. If the size is not a multiple of 3, this fact can be determined by the value of the count on the last line. Extra meaningless data will be included, if necessary, to make the character count a multiple of 4. The body is terminated by a line with a count of zero. This line consists of one ASCII space. The trailer line consists of the word on a line by itself. SEE ALSO
mail(1), uuencode(1), uucp(1). uuencode(4)
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